EN ISO 17633:2025 PDF

Overview

EN ISO 17633:2025 (CEN adoption of ISO 17633:2025) defines the classification system for tubular cored electrodes and rods used in gas‑shielded and non‑gas‑shielded metal arc welding of stainless and heat‑resisting steels. The standard specifies how products are designated based on the all‑weld metal chemical composition, type of core, shielding gas, welding position, and mechanical properties in the as‑welded or heat‑treated condition. This fourth edition supersedes EN ISO 17633:2018 and its 2021 amendment, aligning European and international practice.

Key topics and requirements

• Two classification systems
  • System A - classification based on nominal composition (suffix “A” on relevant clauses/tables).
  • System B - classification based on alloy type (suffix “B” on relevant clauses/tables).
  • Clauses without suffix apply to both systems.
• Product symbol and designation rules covering:
  • All‑weld metal chemical composition symbols.
  • Core type and shielding gas identifiers.
  • Welding position symbols and permitted positions.
• Mechanical property requirements for all‑weld metal (as‑welded or post‑heat‑treated) and associated testing procedures.
• Chemical analysis and rounding procedures for reporting composition.
• Test, retest and delivery conditions, including recommended preheat/interpass guidance and pass sequencing considerations.
• Informative annexes provide comparison charts between systems, core type descriptions, electrode/rod type descriptions, and considerations on weld metal ferrite content.
• Notable updates in the 2025 edition: reformatting to present Systems A and B clearly, updated normative references, addition of a 0.50 % maximum cobalt in classifications, updated compositions for certain alloy designations, and removal of pulsed current as a classification method.

Applications and users

EN ISO 17633:2025 is essential for:

• Welding consumable manufacturers classifying tubular cored electrodes and rods.
• Welding engineers and fabrication shops specifying consumables for stainless and heat‑resisting steel welds.
• Quality assurance teams and inspectors ensuring consumables meet chemical and mechanical classification requirements.
• Procurement and standards writers preparing technical specifications and purchase orders.
• Research and testing laboratories performing composition and mechanical tests aligned with the classification.

Related standards

• ISO 17633:2017 (previous edition)
• EN ISO 17633:2018 and EN ISO 17633:2018/A1:2021 (superseded)
• Reference: ISO/TC 44 (Welding and allied processes)

Keywords: EN ISO 17633:2025, tubular cored electrodes, tubular cored rods, gas‑shielded welding, non‑gas‑shielded welding, stainless steels, heat‑resisting steels, classification, all‑weld metal composition, welding consumables.